let fs = require('fs');
let util = require('util');
let mineReadFile = util.promisify(fs.readFile);
async function readFile(){
  try {
    let res1 = await mineReadFile('./source/11.txt');
    let res2 = await mineReadFile('./source/2.txt');
    let res3 = await mineReadFile('./source/3.txt');
    console.log(res1.toString(),res2.toString(),res3.toString());
  } catch (error) {
    console.log(error);
    console.log('----------');
    console.log(error.code);
  }
}
readFile();